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Tag: bentgrass putting greens

In the midst of a summer with 100+ F temperatures

In 2016, Dr. Fry wrote a blog post titled “Bentgrass Declining? It’s from Western Europe – You Live in Kansas”. Last year we faced high summer temperatures and this year we are facing the same. Like many across the state and beyond, the bentgrass greens at Rocky Ford Turfgrass Research Center are stressed.  To address the summer stress on bentgrass greens I think that it is a good idea to revisit this topic.

Below is Dr. Fry’s article. Enjoy!

In the midst of a summer with 100+ F temperatures, it’s worthwhile to consider some of creeping bentgrass’s preferences and management strategies that might be helpful to reduce its stress, and yours.  See, the thing about creeping bentgrass on putting greens is….

  • It came from Western Europe. You live in Kansas.
Average July maximum temperature (°F) Average July minimum temperature (°F)
London, England 72 55
Manhattan, Kansas 90 68

 

  • Its roots die first, then its leaves. Keep the roots happy and you’ll have happy bentgrass and happy golfers.
  • Its roots prefer to grow at 55 to 65 °F; root growth slows even as low as 80 °F. This summer, temperatures near the surface of greens have been over 100 °F.
  • Faults with construction, drainage, management practices may produce a quality turf surface for 10 or 11 months of the year. It’s the one or two other months that cause problems.   If you want to avoid bentgrass decline, then start with a good rootzone.
  • Rootzones that hold water are warmer and also have less oxygen for root growth. If you don’t have an ideal rootzone, work to improve it in the fall and spring with aggressive core aerification and topdressing.
  • The benefits of coring are often seen during summer stress. Why are there green polka dots within the brown turf?  Turf in those spots has roots!

  • Opening the green’s surface with small, solid tines or spikes can help with water infiltration and root growth during midsummer. Don’t overdo it – the turf is under stress.
  • Although superintendents suspect (and often hope) that a disease is causing the problem in mid-summer, over half of the samples that are evaluated in our lab show no disease.
  • In our climate, air movement across the surface of the green is critical for bentgrass health. If your greens are surrounded, let them free!
  • Maximize summer airflow from the south, but also vent to the north (just like opening two windows to get cross flow in your house).
  • Hand watering can be used to address deficiencies in water distribution of the irrigation system, target localized dry spots, and deal with inconsistencies in water retention and drainage in the root zone. It shouldn’t be overdone or underdone- train and use your best help for handwatering.
  • Syringing refers to applying a light mist of water droplets to leaves only, and then relying upon evaporation of that water to help cool the leaf surface. How effective do you think that is on a humid, July day?  Not very, unless you use a fan to encourage evaporation from the leaf!
  • Trees use light for photosynthesis, so does bentgrass. If trees are shading the green, which is getting the light – the tree, or the turf?
  • Cultivars that are more dense get less Poa invasion, and Poa is more likely to die during summer stress than bentgrass. Plant newer, denser cultivars to reduce Poa.( The photo shows Poa checking out in the heat.)

  • Light applications of nitrogen can be beneficial during heat stress (0.10 lb. N/1,000 sq. ft.)
  • Newer cultivars have been shown to be more heat tolerant than Penncross, but even these will experience decline during prolonged heat.
  • Clean up laps are often the first to show symptoms of stress. Why?  Excessive traffic and wear.  Have you considered a dedicated mower with a slightly higher mowing height for the clean up lap?  Do you skip clean up laps on some days?

Bentgrass Declining? It’s from Western Europe, You live in Kansas

(By Jared Hoyle, KSU Turfgrass Research and Extension)

The past couple weeks have been a struggle to grow bentgrass.  Some areas in Kansas are getting rain but others are not.  The rains have been localized and here at the Rocky Ford Turfgrass Research Center in Manhattan we keep missing the isolated showers.

I know some other golf course are in the same place as we are and it has been a struggle to keep bentgrass alive.  Well, I dug through the blog and found a post from Dr. Jack Fry about bentgrass management in the summer.  Dr. Fry leads of the article with..

“In the midst of a summer with 100+ F temperatures, it’s worthwhile to consider some of creeping bentgrass’s preferences and management strategies that might be helpful to reduce its stress, and yours.  See, the thing about creeping bentgrass on putting greens is….”

Click below to find out more about bentgrass management in the summer.

http://blogs.k-state.edu/turf/bentgrass-declining-its-from-western-europe-you-live-in-kansas-by-dr-fry/

More than you ever want to know about preemergent herbicides

(by Jared Hoyle, KSU Turfgrass Research and Extension)

Ever year I write a blog, a newsletter article, send out a tweet and post on Facebook about applying preemergent herbicides for summer annual grass control. We are typically most concerned with crabgrass so I went back and searched through the blog posts and articles and believe it or not it is all still relevant information! Not much has changed, so for this article I am going to spotlight information across these articles and compare from when I originally wrote it.

Crabgrass emerging in bare ground earlier than turf

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Up first, Methods of Predicting Crabgrass Emergence! In this article I go over the different methods to predict when crabgrass emerges; calendar date, soil temperatures, forsythia blooms, growing degree days. Like last year we have had a fluctuating Spring. In the article from March 14, 2017 I stated that it was 80 deg F on the 12th and was snowing just a couple days before. Sound familiar? Refresh yourself on the different methods and know its not too late to get preemergence herbicides out.

https://blogs.k-state.edu/turf/methods-of-predicting-crabgrass-emergence/

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Next article is for all you golf course turfgrass managers. Preemergence Weed Control in Bentgrass Putting Greens. This article was also from March 2017 and I went through what preemergent herbicides are available to use on bentgrass putting greens. The list of herbicides was from the Turfgrass Weed Control for Professionals 2017 Manual (https://mdc.itap.purdue.edu/item.asp?Item_Number=TURF-100). Going through the 2018 edition…. Guess what again? Not much has changed for use on putting greens but I would encourage you to check out the manual and read the “Tips for Herbicide Use on Golf Course Putting Greens” section on page 108.

https://blogs.k-state.edu/turf/preemergence-weed-control-in-bentgrass-putting-greens/


And now one of my favorite quotes from Benjamin Franklin “An ounce of prevention is worth a pound of cure”. This was the lead in for talking about why preemergent herbicides are worth it! This article talks about what weeds preemergent herbicides work on, how they work, and the growth stages of crabgrass. To “round-up” the article I put a list of options out there, the weeds these preemergent herbicides control and some concerns/comments. One thing that I did not list is the combination products. I only listed the single active ingredients.   There are many combination products as well. (Maybe that will be the next blog post – Combination Preemergent Herbicides.)

https://blogs.k-state.edu/turf/an-ounce-of-prevention-is-worth-a-pound-of-cure-by-benjamin-franklin-that-goes-for-preemergence-herbicides-too/

Always remember to READ THE LABEL for the correct rate, turfgrass tolerance, and specific instructions before application!!!

***Mention of trade names or commercial products in this article is solely for identification purposes and does not imply recommendation or endorsement, nor is criticism implied of similar products not mentioned by Kansas State University.***

Preemergence Weed Control in Bentgrass Putting Greens

(By Jared Hoyle, KSU Turfgrass Research and Extension)

In the previous post about preemerge herbicides there is a table of many preemergence herbicides that available for professional turfgrass managers.  But when we start talking bout preemerge herbicides that we can use on bentgrass putting greens the list gets really short.  There are not many options out there for PREs on creeping bentgrass putting greens due to the injury they can cause to the putting surface.

Every golf course superintendent knows that one of the main priorities on the golf course is the putting greens. Therefore, weed control on the putting greens is a priority as well.  So lets just to go over some of the PREs that are labeled for creeping bentgrass putting greens and I will also mention one comment about each.

  • bensulide (Bensumec 4FL, Pre-San 12.5G, Weedgrass Preventer) – With this product you are not able to reseed for 4 months and do not use on greens that have more than 50% annual bluegrass.
  • bensulide +oxadiazon (goosegrass/crabgrass control) – To prevent injury apply two half rate treatments 10-14 days apart.
  • dithiopyr (Fertilizers w/ dithiopyr) – Older bentgrass varieties may result in undesirable injury.
  • siduron (Tuperson) – May be applied at time of seeding or to established creeping bentgrass for crabgrass control and bermudagrass suppression.

Also, you can see the list is a lot shorter then the list in the previous post but that is why managing bentgrass is so difficult.  Turfgrass managers must to do whatever they can to have a healthy growing creeping bentgrass system to prevent weeds coming in because once they are there, there isn’t many options to git ride of them.

Information in the previous list was acquired from “Turfgrass Weed Control for Professionals” by A. Patton and D. Weisenberger, Purdue University (and 11 collaborating states including Kansas). For more information about purchasing this publication see;

https://blogs.k-state.edu/turf/new-weed-control-publication-for-turfgrass-professionals/ 

Always remember to READ THE LABEL for the correct rate, turfgrass tolerance, and specific instructions before application!!!

***Mention of trade names or commercial products in this article is solely for identification purposes and does not imply recommendation or endorsement, nor is criticism implied of similar products not mentioned by Kansas State University.***

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